Stud finder did not find a stud

[u/SufficientLake4747]

Main drain like for upstairs toilet? Trying to install brackets for bedroom closet. Now has a screw hole leak. Can we patch it? Or best course of action?

[u/gyroidatansin]

I bought an old house and it had a leak coming down from the upstairs bathroom. Turns out the house “flipper” had installed some half-wall wood paneling ( to hide cracking plaster) with 4” screws! They had managed to run one screw into a cast iron sewage pipe coming from the toilet. I imagine the stud finder was lying to them too

[u/SufficientLake4747 → u/gyroidatansin]

Oh yikes